ubuntu@ubuntu:~$ sudo mount /dev/sdc3 /mntmount: block device /dev/sdc3 is write-protected, mounting read-only
NTFS signature is missing.
Failed to mount '/dev/sdc3': Invalid argument
The device '/dev/sdc3' doesn't seem to have a valid NTFS.
Maybe the wrong device is used? Or the whole disk instead of a
partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?